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Income Taxes (Deferred Tax Assets (Liabilities)) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets (liabilities):        
Tax intangibles basis greater than book basis $ 718 $ 1,101    
Allowance for doubtful accounts 50 36    
Unearned income 1,314 469    
Federal and state net operating losses 14,166 13,344    
Capital Loss Carryforward 523 192    
Other 399 (4)    
Accrued expenses 465 659    
Tax property basis greater than book basis (2,721) (2,910)    
Prepaid expenses (91) (2,377)    
Net deferred tax asset 14,823 10,510    
Valuation allowance (14,938) (11,581) $ (14,483) $ (15,422)
Net deferred tax asset (liability) $ (115) $ (1,071)